Make sure diagnostic data is output in deterministic order ZHA (home-…

…assistant#123551)

Make sure diagnostic data is output in deterministic order

Sets are not ordered, so the tests for this failed sporadically since it is
converted into a list when converted to json.

homeassistant/components/zha/diagnostics.py

@@ -166,5 +166,7 @@ def get_cluster_attr_data(cluster: Cluster) -> dict:
             }
             for attr_id, attr_def in cluster.attributes.items()
         },
-        UNSUPPORTED_ATTRIBUTES: cluster.unsupported_attributes,
+        UNSUPPORTED_ATTRIBUTES: sorted(
+            cluster.unsupported_attributes, key=lambda v: (isinstance(v, str), v)
+        ),
     }